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Update docs/releasenotes/8.2.0.rst

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Co-authored-by: Andrew Murray <3112309+radarhere@users.noreply.github.com>
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@ -77,7 +77,7 @@ be specified through a keyword argument::
ImageOps.autocontrast: preserve_tone
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
The default behaviour of the :py:meth:`~PIL.ImageOps.autocontrast` is to normalize
The default behaviour of :py:meth:`~PIL.ImageOps.autocontrast` is to normalize
separate histograms for each color channel, changing the tone of the image. The new
``preserve_tone`` argument keeps the tone unchanged by using one luminance histogram
for all channels.